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This is normal. Chickens ususlly lay through their first winter unless they are late summer/early fall chicks, in the fall, they start molting and don't lay, then it's common for birds not to lay their second winter. They'll begin again once there is longer days again, so soon.

How old are they?

There are several threads on this already. There's 0 scientific evidence of anything wrong with any feed. How old are your birds? They likely hit their fall molt, then winter break. They should start soon with daylight increasing.